@prudello welcome to the Nextcloud community and thanks for supporting the snap 
Sorry to have to say that Memories is one of those apps known to cause issues with the snap.
Similar to Recognize the Memories app tries to load tensorflow in node.js and will bump into glibc 2.27 and fail due to Snap confinement, so the Memories app won’t work with the snap until this issue is solved.
see also New to linux in general. Having trouble writing to external local drive - #5 by scubamuc